CA1103530A - Composite structure vascular prostheses and process for production thereof - Google Patents

Composite structure vascular prostheses and process for production thereof

Info

Publication number
CA1103530A
CA1103530A CA285,033A CA285033A CA1103530A CA 1103530 A CA1103530 A CA 1103530A CA 285033 A CA285033 A CA 285033A CA 1103530 A CA1103530 A CA 1103530A
Authority
CA
Canada
Prior art keywords
water
tube
vascular prosthesis
soluble polymer
polymer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA285,033A
Other languages
English (en)
French (fr)
Inventor
Koichi Okita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP51099808A external-priority patent/JPS5834137B2/ja
Priority claimed from JP52079387A external-priority patent/JPS5937979B2/ja
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Application granted granted Critical
Publication of CA1103530A publication Critical patent/CA1103530A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/40—Impregnation
    • C08J9/42—Impregnation with macromolecular compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/14—Macromolecular materials
    • A61L27/16—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28—Materials for coating prostheses
    • A61L27/34—Macromolecular materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2421/00—Characterised by the use of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2439/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Derivatives of such polymers

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Epidemiology (AREA)
  • Dermatology (AREA)
  • Pulmonology (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Gastroenterology & Hepatology (AREA)
  • Materials Engineering (AREA)
  • Cardiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Materials For Medical Uses (AREA)
  • Prostheses (AREA)
CA285,033A 1976-08-20 1977-08-19 Composite structure vascular prostheses and process for production thereof Expired CA1103530A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP99808/76 1976-08-20
JP51099808A JPS5834137B2 (ja) 1976-08-20 1976-08-20 複合構造血管補綴物及びその製造方法
JP52079387A JPS5937979B2 (ja) 1977-07-01 1977-07-01 複合構造血管補綴物及びその製造方法
JP79387/77 1977-07-01

Publications (1)

Publication Number Publication Date
CA1103530A true CA1103530A (en) 1981-06-23

Family

ID=26420403

Family Applications (1)

Application Number Title Priority Date Filing Date
CA285,033A Expired CA1103530A (en) 1976-08-20 1977-08-19 Composite structure vascular prostheses and process for production thereof

Country Status (10)

Country Link
US (1) US4193138A (enrdf_load_stackoverflow)
AU (1) AU506964B2 (enrdf_load_stackoverflow)
BR (1) BR7705520A (enrdf_load_stackoverflow)
CA (1) CA1103530A (enrdf_load_stackoverflow)
DE (1) DE2737486B2 (enrdf_load_stackoverflow)
FR (1) FR2361862A1 (enrdf_load_stackoverflow)
GB (1) GB1537448A (enrdf_load_stackoverflow)
IT (1) IT1106274B (enrdf_load_stackoverflow)
NL (1) NL165647C (enrdf_load_stackoverflow)
SE (1) SE433438B (enrdf_load_stackoverflow)

Families Citing this family (90)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5413694A (en) * 1977-07-01 1979-02-01 Sumitomo Electric Industries Composite blood vessel prosthesis and method of producing same
CA1147087A (en) * 1977-12-21 1983-05-24 David Goldfarb Graphite impregnated prosthetic vascular graft materials
DE2947743C2 (de) * 1978-11-30 1983-12-08 Sumitomo Electric Industries, Ltd., Osaka Einheitliches, poröses röhrenförmiges Gebilde aus Polytetrafluoräthylen
US4713070A (en) * 1978-11-30 1987-12-15 Sumitom Electric Industries, Ltd. Porous structure of polytetrafluoroethylene and process for production thereof
US4286341A (en) * 1979-04-16 1981-09-01 Iowa State University Research Foundation, Inc. Vascular prosthesis and method of making the same
US4321914A (en) * 1980-04-22 1982-03-30 W. L. Gore & Associates, Inc. Percutaneous conduit having PTFE skirt
US4385093A (en) * 1980-11-06 1983-05-24 W. L. Gore & Associates, Inc. Multi-component, highly porous, high strength PTFE article and method for manufacturing same
WO1982001647A1 (en) * 1980-11-17 1982-05-27 Robert L Kaster Vascular graft
US4441215A (en) * 1980-11-17 1984-04-10 Kaster Robert L Vascular graft
FR2499848B1 (fr) * 1981-02-18 1985-07-05 Biotrol Sa Lab Prothese vasculaire et dispositif pour sa mise en place
US5034265A (en) * 1983-08-01 1991-07-23 Washington Research Foundation Plasma gas discharge treatment for improving the compatibility of biomaterials
US4594407A (en) * 1983-09-20 1986-06-10 Allied Corporation Prosthetic devices derived from krebs-cycle dicarboxylic acids and diols
JPS60227763A (ja) * 1984-04-27 1985-11-13 筏　義人 抗血栓性医用材料
US5219894A (en) * 1984-12-25 1993-06-15 Sumitomo Electric Industries, Ltd. Method for treating the surface of a thin porous film material
JPS61151245A (ja) * 1984-12-25 1986-07-09 Sumitomo Electric Ind Ltd 多孔性薄膜材料の表面処理方法
US4632842A (en) * 1985-06-20 1986-12-30 Atrium Medical Corporation Glow discharge process for producing implantable devices
US4718907A (en) * 1985-06-20 1988-01-12 Atrium Medical Corporation Vascular prosthesis having fluorinated coating with varying F/C ratio
US4619172A (en) * 1985-07-05 1986-10-28 Rafael Perez Cutting saw for grinding solid materials
DE3627487A1 (de) * 1986-08-13 1988-02-25 Bernd Dr Steckmeier Gefaessprothese
JPH0696023B2 (ja) * 1986-11-10 1994-11-30 宇部日東化成株式会社 人工血管およびその製造方法
US4877029A (en) * 1987-03-30 1989-10-31 Brown University Research Foundation Semipermeable nerve guidance channels
US4816339A (en) * 1987-04-28 1989-03-28 Baxter International Inc. Multi-layered poly(tetrafluoroethylene)/elastomer materials useful for in vivo implantation
US5061276A (en) * 1987-04-28 1991-10-29 Baxter International Inc. Multi-layered poly(tetrafluoroethylene)/elastomer materials useful for in vivo implantation
US5181903A (en) * 1988-03-25 1993-01-26 Duke University Method for improving a biomaterial's resistance to thrombosis and infection and for improving tissue ingrowth
US4973609A (en) * 1988-11-17 1990-11-27 Memron, Inc. Porous fluoropolymer alloy and process of manufacture
US4990158A (en) * 1989-05-10 1991-02-05 United States Surgical Corporation Synthetic semiabsorbable tubular prosthesis
US5217495A (en) * 1989-05-10 1993-06-08 United States Surgical Corporation Synthetic semiabsorbable composite yarn
US5147400A (en) * 1989-05-10 1992-09-15 United States Surgical Corporation Connective tissue prosthesis
US5376118A (en) * 1989-05-10 1994-12-27 United States Surgical Corporation Support material for cell impregnation
US5104400A (en) * 1989-05-26 1992-04-14 Impra, Inc. Blood vessel patch
US4955899A (en) * 1989-05-26 1990-09-11 Impra, Inc. Longitudinally compliant vascular graft
US5152782A (en) * 1989-05-26 1992-10-06 Impra, Inc. Non-porous coated ptfe graft
US5100422A (en) * 1989-05-26 1992-03-31 Impra, Inc. Blood vessel patch
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JP3149970B2 (ja) * 1991-08-06 2001-03-26 ジャパンゴアテックス株式会社 散気材及びそれを用いたガスの散気方法
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US6348066B1 (en) * 1995-11-07 2002-02-19 Corvita Corporation Modular endoluminal stent-grafts and methods for their use
US5628788A (en) * 1995-11-07 1997-05-13 Corvita Corporation Self-expanding endoluminal stent-graft
US5800512A (en) * 1996-01-22 1998-09-01 Meadox Medicals, Inc. PTFE vascular graft
CA2197375C (en) * 1996-02-15 2003-05-06 Yasuhiro Okuda Artificial blood vessel
CA2199890C (en) * 1996-03-26 2002-02-05 Leonard Pinchuk Stents and stent-grafts having enhanced hoop strength and methods of making the same
US5874165A (en) * 1996-06-03 1999-02-23 Gore Enterprise Holdings, Inc. Materials and method for the immobilization of bioactive species onto polymeric subtrates
US5914182A (en) * 1996-06-03 1999-06-22 Gore Hybrid Technologies, Inc. Materials and methods for the immobilization of bioactive species onto polymeric substrates
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US6010529A (en) * 1996-12-03 2000-01-04 Atrium Medical Corporation Expandable shielded vessel support
US5925074A (en) * 1996-12-03 1999-07-20 Atrium Medical Corporation Vascular endoprosthesis and method
US6056993A (en) * 1997-05-30 2000-05-02 Schneider (Usa) Inc. Porous protheses and methods for making the same wherein the protheses are formed by spraying water soluble and water insoluble fibers onto a rotating mandrel
US6187038B1 (en) 1998-04-08 2001-02-13 Sulzer Carbomedics Inc. Small bore biologic graft with therapeutic delivery system
US6368347B1 (en) 1999-04-23 2002-04-09 Sulzer Vascutek Ltd. Expanded polytetrafluoroethylene vascular graft with coating
US7641958B2 (en) 2002-04-25 2010-01-05 Gore Enterprise Holdings, Inc. Membrane for use in sutured or sutureless surgical procedures
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US7789908B2 (en) * 2002-06-25 2010-09-07 Boston Scientific Scimed, Inc. Elastomerically impregnated ePTFE to enhance stretch and recovery properties for vascular grafts and coverings
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US7981862B2 (en) 2003-08-19 2011-07-19 Biosurface Engineering Technologies, Inc. Composition comprising BMP-2 amplifier/co-activator for enhancement of osteogenesis
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US7468210B1 (en) 2002-12-10 2008-12-23 Biosurface Engineering Technologies, Inc. Cross-linked heparin coatings and methods
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US9861346B2 (en) 2003-07-14 2018-01-09 W. L. Gore & Associates, Inc. Patent foramen ovale (PFO) closure device with linearly elongating petals
US20080227696A1 (en) * 2005-02-22 2008-09-18 Biosurface Engineering Technologies, Inc. Single branch heparin-binding growth factor analogs
US8029563B2 (en) * 2004-11-29 2011-10-04 Gore Enterprise Holdings, Inc. Implantable devices with reduced needle puncture site leakage
US7381331B2 (en) * 2005-09-30 2008-06-03 General Electric Company Hydrophilic membrane and associated method
US7631768B2 (en) * 2005-11-04 2009-12-15 General Electric Company Membrane and associated method
US7291696B2 (en) * 2005-11-04 2007-11-06 General Electric Company Composition and associated method
US8163002B2 (en) * 2005-11-14 2012-04-24 Vascular Devices Llc Self-sealing vascular graft
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US7820172B1 (en) 2006-06-01 2010-10-26 Biosurface Engineering Technologies, Inc. Laminin-derived multi-domain peptides
US9005242B2 (en) 2007-04-05 2015-04-14 W.L. Gore & Associates, Inc. Septal closure device with centering mechanism
US20130165967A1 (en) 2008-03-07 2013-06-27 W.L. Gore & Associates, Inc. Heart occlusion devices
DE102009004848B3 (de) * 2009-01-16 2010-04-15 Sartorius Stedim Biotech Gmbh Elektronenstrahlinduzierte Modifizierung von Membranen durch Polymere
US8956389B2 (en) 2009-06-22 2015-02-17 W. L. Gore & Associates, Inc. Sealing device and delivery system
US20120029556A1 (en) 2009-06-22 2012-02-02 Masters Steven J Sealing device and delivery system
US9415193B2 (en) 2011-03-04 2016-08-16 W. L. Gore & Associates, Inc. Eluting medical devices
US9770232B2 (en) 2011-08-12 2017-09-26 W. L. Gore & Associates, Inc. Heart occlusion devices
US10173038B2 (en) 2012-09-05 2019-01-08 W. L. Gore & Associates, Inc. Retractable sheath devices, systems, and methods
US10828019B2 (en) 2013-01-18 2020-11-10 W.L. Gore & Associates, Inc. Sealing device and delivery system
US9814560B2 (en) 2013-12-05 2017-11-14 W. L. Gore & Associates, Inc. Tapered implantable device and methods for making such devices
US9808230B2 (en) 2014-06-06 2017-11-07 W. L. Gore & Associates, Inc. Sealing device and delivery system
US10357385B2 (en) 2015-06-05 2019-07-23 W. L. Gore & Associates, Inc. Low bleed implantable prosthesis with a taper

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US3511684A (en) * 1967-05-17 1970-05-12 Abbott Lab Method of treating polymeric resin to display nonthrombogenicity
AR205110A1 (es) * 1974-04-02 1976-04-05 Gore & Ass Protesis vascular artificial
US6436135B1 (en) * 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft

Also Published As

Publication number Publication date
GB1537448A (en) 1978-12-29
FR2361862B1 (enrdf_load_stackoverflow) 1981-10-02
NL165647C (nl) 1981-05-15
DE2737486B2 (de) 1980-07-10
DE2737486A1 (de) 1978-02-23
SE7709382L (sv) 1978-02-21
FR2361862A1 (fr) 1978-03-17
US4193138A (en) 1980-03-18
NL7709199A (nl) 1978-02-22
SE433438B (sv) 1984-05-28
BR7705520A (pt) 1978-04-25
AU2805277A (en) 1979-02-22
IT1106274B (it) 1985-11-11
NL165647B (nl) 1980-12-15
AU506964B2 (en) 1980-01-31

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